topic How to obtain symbology from a KML file in ArcGIS JavaScript Maps SDK Questions

How to obtain symbology from a KML file

StephenLead — Sat, 11 Dec 2021 06:29:47 GMT

See the simple sample which I made by modifying an Esri sample, which lloads a KML file onto the basemap.

Where is the symbology being defined? If I break around line 38, I can't see where the symbology is specified.

var kmlUrl = 'http://www.ci.redding.ca.us/KML/SacRiverTrail.kml';
    kml = new esri.layers.KMLLayer(kmlUrl);
    map.addLayer(kml);


    dojo.connect(kml, 'onLoad', function(lyr) {
      // Collect the line features from the KML layer
      kmlGeoms = dojo.map(lyr.getLayers()[0].graphics, function(g) {
       //g.symbol is blank, so where is the symbol coming from?
       return g.geometry;
      });

Thanks,
Steve

Re: How to obtain symbology from a KML file

derekswingley1 — Sat, 11 Dec 2021 06:29:49 GMT

As you know, the KMLLayer relies on a utility running on arcgis.com to convert a KML file to JSON. This utility reads the symbology from the KML file and creates renderers that are applied to the resulting feature layers. Once you have a reference to your feature layer(s), look at each layer's renderer property. In your example, the layer has a SimpleRenderer so it has a single symbol. Run this in the console after loading your example:

kml.getLayers()[0].renderer.symbol.width;
kml.getLayers()[0].renderer.symbol.color;
kml.getLayers()[0].renderer.symbol.declaredClass;

Re: How to obtain symbology from a KML file

StephenLead — Sat, 14 Jul 2012 05:04:12 GMT

As you know, the KMLLayer relies on a utility running on arcgis.com to convert a KML file to JSON. This utility reads the symbology from the KML file and creates renderers that are applied to the resulting feature layers.

I didn't actually know that - thanks, it really helps.

Cheers,
Steve